SIMPLY INIMITABLE.
15
15
Control logic for a 3 speed fan coil in cooling:
When temperature decreasing
Where:
Tsp : Target setpoint temperature
Tdcv1 : regulation di erential in cooling for V1 Speed
Tdcv2 : regulation di erential in cooling for V2 Speed
Tm : Actual measured temperature
18. Fan coil control %
(or generic continuous control)
19. Temperature probe failure / out of
range measurement
Logic and parameters are the same used in On/o
with PWM control mode; the di erence is that now
the proportional value is sent to the bus via a 1 byte
object format as a % value from 0% to 100%.
This mode is useful to control fan coils (selecting 2
or 4 pipes) or generic proportional actuators as valve
drivers only linking the 1 byte communication object
and avoiding to link the valve objects.
CONTINUOUS CONTROL object
This 1 Byte object send % control value to actuator.
SET MAN/AUTO MODE object
SET MAN/AUTO MODE Objects is a CO for changing
the calculation mode for CONTINUOUS CONTROL
object; in AUTO Mode the calculation is carried out
via a proportional algorithm (Δ temperature between
actual temp. and Setpoint Temp) and a integral cor-
rection (Cycle Time ); in MAN mode the output value
control is set by the value send to the object FORCE
VALUE IN MANUAL MODE object.
• If the temperature probe is disconnected or
in short circuit the control action is interrupted and
the controlled actuators are switched o .
• The value of temperature sent on the bus in
case of probe disconnection or short circuit or for out
of range measured value is 0 °C (according to KNX
DPT_Value_Temp 9.001)
TEMPERATURE SENSOR ALARM object
In event of temperature probe failure / out of range
measurement a telegram from 1 bit communication
object - obj #33: “Temperature sensor alarm” - is sent
on the bus with value 1. As soon the temperature sen-
sor works good again a value “0” is transmitted.
To correctly manage the use of internal and/or addi-
tional refers to the following possible con guration
modes:
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